Well my entire music collection that I re-ripped in uncompressed flac is about 94.5GB in size and when they're all in a compressed .7z each album, is only about 79.1GB. Foobar2000 media player for windows supports this with a plug-in, that's why I was wondering if it would be possible with Poweramp.

Would it be possible to get support for .7z archives? I've recently re-ripped all my music albums flac and having my albums in a compressed .7z archive would definitely free up some space on my microSD card. I already have enough space as it is on my 256GB card but would be really nice if it would be possible to free up some more.